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It is sometimes useful to find a function to model data, then use it to make predictions. Think about... How can you use data on the number of cars with large engines produced in previous years to predict the number of cars that will be produced in future years?

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Year Thousands of cars (engine size 2 litres or more) Are there more cars with larger engines on the roads today? Source:

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Year Thousands of cars (engine size 2 litres or more) Source: Finding a new model Draw a graph to show the data for 2000 to Find a new model.

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Reflect on your work Why is the percentage error a better measure for the accuracy of a model than the difference between the actual value and the value predicted by the model? What is indicated by a negative percentage error? Gas guzzlers Is your model valid for all values of t ?